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| author | Suneel Garapati | 2015-06-09 09:31:50 +0200 |
|---|---|---|
| committer | Ulf Hansson | 2015-08-17 11:32:41 +0200 |
| commit | d1955c3a9a1d89c53c9e7ce3b87799f8db1855c1 (patch) | |
| tree | b599c2a9e9ccfdd317c3bcc31879648bf5368602 /drivers/mmc/host | |
| parent | mmc: pxamci: switch over to dmaengine use (diff) | |
| download | kernel-qcow2-linux-d1955c3a9a1d89c53c9e7ce3b87799f8db1855c1.tar.gz kernel-qcow2-linux-d1955c3a9a1d89c53c9e7ce3b87799f8db1855c1.tar.xz kernel-qcow2-linux-d1955c3a9a1d89c53c9e7ce3b87799f8db1855c1.zip | |
mmc: sdhci: add quirk SDHCI_QUIRK_CLOCK_DIV_ZERO_BROKEN
adds quirk for controllers whose clock divider zero is broken,
sdhci_set_clock function will incorporate this modification.
Signed-off-by: Suneel Garapati <suneel.garapati@xilinx.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 3 | ||||
| -rw-r--r-- | drivers/mmc/host/sdhci.h | 2 |
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 1dbe93232030..2ae8415e59f8 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1210,6 +1210,9 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) } real_div = div; div >>= 1; + if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN) + && !div && host->max_clk <= 25000000) + div = 1; } } else { /* Version 2.00 divisors must be a power of 2. */ diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 5521d29368e4..67046ca0c1f0 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -409,6 +409,8 @@ struct sdhci_host { #define SDHCI_QUIRK2_SUPPORT_SINGLE (1<<13) /* Controller broken with using ACMD23 */ #define SDHCI_QUIRK2_ACMD23_BROKEN (1<<14) +/* Broken Clock divider zero in controller */ +#define SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN (1<<15) int irq; /* Device IRQ */ void __iomem *ioaddr; /* Mapped address */ |